Michael D. Cohen, the attorney named in explosive but unsubstantiated allegations about secret links among the Trump camp, Russian operatives and cyber hackers, has long been a troubleshooter for President-elect Donald Trump.
“I am the fix-it guy,” Mr. Cohen said in an interview last week.
“Anything that he needs to be done, any issues that concern him, I handle.”Mr. Cohen’s role ranged from defending his boss on TV to...